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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b823697c4c7153d335adf8e55c3df06f76f8a490d7654a801cd5120c3289ffae' 
  AND token = '43ZBXAeo8M09SgEvpB2FYt1ZzWe3NHAPS96rm2hXYyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}